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Cabela's, Benetton, and Mothercare are among national retailers that have tested the idea of tracking people with cellphone signals and video cameras as they shop stores, according to the New York Times.

Amid the tablets and the smartphones at CES, Toyota is showing off a robot car, called the Lexus LS460. In New York's Chelsea neighborhood, they turned an old elevated rail line into a public park. Now that part of town is getting another amenity with no admission charge: Free Wi-Fi courtesy of Google.

A controversial new experiment at South by Southwest puts Wi-Fi units in the hands of the homeless. Accused of condescension and exploitation, "Homeless Hotspots" creators hope the debate will encourage entrepreneurship and visibility.